Dresser says the evidence suggests that heat can influence us in sometimes indiscernible ways. “All of these [studies] seem to point to a reduced ability to think clearly and quickly and efficiently when the body is too hot,” he says.
There’s also research to suggest that heat can make you moodier or irritated, in part, perhaps, by raising cortisol levels, and inducing a stress response.
NPR has a text version of their site, see article at https://text.npr.org/1190627995
The 1st study https://journals.plos.org/plosmedicine/article?id=10.1371/journal.pmed.1002605 mentions that “Students chose their summer housing preferences on a first-come, first-serve basis in a manner that was not expected to be associated with exposure or outcome.”, but couldn’t this be effected by wealth, and effect the results?
I am living proof of that second point, but my body always has a natural warmth, so in any kind of heat I feel like I’m melting.
